EFFECT OF SOIL TILLAGE METHODS AND CROP SYSTEMS ON NITROGEN ABSORPTION AND CORN YIELD
Abstract
With the objetive to evaluate the effect of soil tillage methods and crop systems on N uptake and com yield, an experiment was established in 1985 at the University Experimental Station in Eldorado do Sul (RS), Brazil. Thrce soil tillage methods (conventional, reduced and no tillage), three crop systems (oats(Avena strigosa)/corn, oats+clover (Trifolium subterraneum)lcom, oats+clover/corn+cowpea (Vigna unguiculata)) and two leveis of nitrogen(0 and 120 kg/ha) were tested. The results of the first five years of N absorption and com yield are reponcd in this paper. The dry matter yield of winter cover crops and its N contens above ground varied from 2.6 to 6.7 t/ha and 28 to 136 kg/ha, respectively. In 1988, the year of best clover establishment, this pasture had 80 kg/ha of N and the oats 56 kg/ha, in the oats+clover mixture. The com grown after, without N, produced 80% of the yield obtained after oats with 120 kg/ha of N. The tillage methods did not affect the yield and N absorption by com.
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